Originally Posted by RH Clark

I've been reading old threads and it seems I can replace the Tourney rear derailleur on my 2017 Trek Marlin 5 29er with 3X7 drivetrain with the 9 speed Deore XT.

I have dropped the chain on the Tourney several times already. I like the bike and only need a bit better shifting and less chain drop. I don't need a better suspension for my riding. I was hoping the stronger spring would help my issues and at about $70 seemed a good place to start. If this won't work or help my issues, please advise.

This is the rear derailleur I am considering. Will it be a drop in upgrade?
https://www.jensonusa.com/Shimano-XT...ear-Derailleur